Common Size (mm) | Typical Application |
|---|
ST4.2 × 19 | Sheet metal fastening |
ST4.2 × 25 | Metal panel installation |
ST4.8 × 19 | Light-gauge metal fastening |
ST4.8 × 25 | Sheet metal and cladding |
ST4.8 × 32 | Metal profile fastening |
ST5.5 × 25 | Roofing and construction |
ST5.5 × 32 | Metal roofing and panels |
ST5.5 × 38 | Steel profile fastening |
ST6.3 × 38 | Metal roofing and structural cladding |
ST6.3 × 50 | Longer-reach metal fastening |
Core Technical Parameters
Parameter | Specifications |
|---|
Product Name | Bi-Metal Self-Drilling Screw |
Alternative Name | Composite Self-Drilling Screw |
Body Material | Stainless Steel 304 / Stainless Steel 316, subject to availability |
Drill Point Material | Hardened Carbon Steel / Hardened Alloy Steel, depending on design |
Diameter | ST4.2 / ST4.8 / ST5.5 / ST6.3 and other specified sizes |
Length | Multiple lengths according to requirements |
Head Style | Hex Washer Head / Hex Flange Head / Other specified designs |
Drill Point | Self-Drilling Point; drilling capacity depends on point design |
Washer Option | EPDM Bonded Washer / Other specified sealing washer |
Surface Treatment | Specified protective coating or finish, depending on material and application |
Standard | DIN 7504 K or other applicable specification, subject to conformity |
Applications | Metal Roofing / Sheet Metal / Steel Profiles / Cladding |
Packaging | Bulk / Carton / Customized Packaging |
Customization | Size / Material Combination / Head Style / Washer / Finish |
MALAXY Bi-Metal Self-Drilling Screws are engineered for metal-to-metal fastening applications where drilling performance and corrosion resistance are important. Their composite construction combines a stainless steel screw body with a hardened steel drilling point, allowing the two materials to perform different functions within a single fastener.
The hardened drill point enables drilling and thread formation in compatible metal substrates, while the stainless steel body provides corrosion resistance appropriate to the selected stainless grade and service environment. This design is suitable for a range of roofing, cladding, sheet metal and industrial fastening applications, subject to the specified drilling capacity and installation requirements
Available in various diameters, lengths and head configurations, these screws can be supplied with compatible sealing washers for applications requiring a weather-resistant connection. Material combinations, coatings and washer specifications can be selected according to project requirements.
Key Features
Bi-Metal Construction: Combines a stainless steel body with a hardened steel drill point.
Self-Drilling Design: Supports drilling and fastening in compatible metal substrates without a separate pilot hole.
Corrosion Resistance: Stainless steel body options for applications with specified corrosion-resistance requirements.
Multiple Sizes: Various diameters and lengths available according to specification.
Head Options: Hex washer head, hex flange head and other designs, subject to availability.
Sealing Options: EPDM bonded washers available for compatible roofing and cladding applications.
Custom Specifications: Material combinations, dimensions, coatings and packaging can be specified for OEM orders.
B2B Supply: Suitable for importers, wholesalers, distributors and industrial purchasing teams.
Typical Applications
Metal Roofing · Steel Sheet Installation · Metal Cladding · Steel Profiles · Sandwich Panels · Industrial Metal Fastening · Compatible Solar Mounting Applications
Application suitability depends on the actual screw design, substrate thickness, washer configuration, environmental conditions and relevant project requirements.
Why Choose MALAXY?
MALAXY is a fastener manufacturer and exporter based in Zhejiang, China, with manufacturing experience dating back to 2001. We offer a broad range of screws, bolts, nuts, anchors and other fastening products for international B2B customers.
MALAXY supports overseas importers, wholesalers, distributors and manufacturers with product specification options, bulk supply and customized packaging services.
Contact MALAXY for technical drawings, material confirmation, samples and bulk quotations.
